I already tried to change the ghostscript command, which generated the tiff file, but that did not seem to do the trick:gs -q -r400x400 -dNOPAUSE -dBATCH -sDEVICE=tiffg4 -sPAPERSIZE=letter -sOutputFile=fax.tif input.pdf

Although it might send the fax with more data, the actual image information is the same.I am now trying to find out what you actually need to do to improve image qualityNevermind .... I was not paying attention the solution above works fine. It's still a fax....